I just got an Intel 900p M.2 SSD and my Asus Z170-AR Bios isn't seeing it when I switch to RAID. The drive is seen by the BIOs when I go back to AHCI. It is seen as a device on my Device Manager and the drivers are updated. when i check the events on the Device Manager it says that it "failed to migrate". I have disabled SATA6G_1, and SATA6G_2 since it is an either or situation, as well. Any help would be appreciated.
More about900p ssd recognized z170 raid
Question: What are you trying to do with the RAID?
Your question made me realize the my don't need to be in RAID for my M.2 to work. That being said I have cleared my CMOS and turned on M.2 on the Onboard Configuration tab in my BIOs. Still nothing.
Is there an NVME setting? It shouldn't be raid/ide or ahci. Did you look through the installation guide for anything on m.2 nvme boot?